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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c62df58d118cb4b7a821bb548aee9ab0e17ebcf6965b30d0cdb3ef21bab81d' 
  AND token = 'yG8I3VKHh0gzFporb8THrTHj8YdzRIGU2ByDv48T8E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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