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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd4d2ce7a7745f0f1e24c777af69060d18b3a4d7d1521483db4aca1edb4495e' 
  AND token = 'XU3XVH8R9pRvdSYtvzStT8LIHSMH5GVbsjmFfOazq9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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