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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611113f34ab59d4a78a0a062f17ef0ac592e278b84cd0874d164a3bbacd0fa63' 
  AND token = 'MNfugQ+AsUcfYwhuLSLYhPAHFNbo8/6MQBpMrVR2Wic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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