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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ae116e38082b3f1432c4cdf74700b600a1c1e655c5eb135795804992930cb7' 
  AND token = 'a/k4m9ih6YaJNQV0D34SddfluQn22kuH5KZ18japfBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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