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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62eee6fab6326a00fd553d00f8652d79802a02c6b84acdf3ce945f4f16ff785' 
  AND token = '6DZUbszv5XqcdvdkgHDIXdMGVLqMi5PxrMXcK8svVdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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