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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532614d692df8f7cec799a32edcf55c27af451d4f70d6c256ca247039c04adb3' 
  AND token = 'td5tOobQPQ6eu3ZShZpkwfLg8ALll5F7uZbfkCaXm8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}