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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e79209ffe79fd7db02060a7a82a1ae819b36f0f3cf23b4f26154fa621c8c5d' 
  AND token = 'HETGI7o219rLV4P9RpujcNPJd+juTqQZcEg/7veox4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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