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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8252859e3838d97ef5f1aa25d3c143e6029af5a8a11e3426161f0d683d81df79' 
  AND token = 'l9EhQy7/yWNqyN7pGbEFJ1jxPUK49n2F7E/0fvDX8NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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