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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370cb1b5416329d67f72eb2014e8eeab4e1465fb754b978b684417956f46b16c' 
  AND token = '+gR6RKAL0en7OtlCXWJqzfRxkL2S8X/k0zKazSpuPVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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