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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355c58e7af4575b8d5c4a73100de458e3ca0f363dcb227ea83ddc3d8eb08b260' 
  AND token = 'kv07CMDqpR4acBNtwNmEdp9CNws7L3tX6Cee8FuIFoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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