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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0db1228c7833e688fa920ccb61482f41ef76fb2bd99d0e995c7edb653962db' 
  AND token = 'tsnyAHpwS3UYd9Mn/S54bDovWJv9Q1SIrADvrsGjGK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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