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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176399f8bcb37c0cdd1b8f98caf6a6f25f11fb2cb32e58e64d258ac8c0319aa7' 
  AND token = 'exRb6RNhcks9ULC8q/PyOaWDpPCGIcWywxiK2900ado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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