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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2401f40eeb24ef05e13e849440e1b628dea5472696d95207795768763e713bb6' 
  AND token = 'r7n9p4zUO891cVcIlTBQfSQU9b5BWLxaYZ32hdKNAKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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