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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1eeaea1edb46af2b6974b0c49e778fcc7e278f76c686114d6ae8bfcff871055' 
  AND token = 'N5OYki3uxYJ7UfIg3An1pUrEUkIWaz8KvaK8tYGlAPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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