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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6cd1a3bdcf2ecbff16f95bd4fceb76bb9cae0f24165ecaf3fd78d2828fbb76' 
  AND token = 'i6VnArOPvNS1jWR/c6CnjhXOkXEtuwASm0JkudUwJjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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