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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae88a771d8a6e3575123baa211139a15109aa4628bd616c1304503309ea98e0e' 
  AND token = 'KMIfCpMFUYtS1UJ/FftnbfBseMeY+WEtdSeHmnhnxVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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