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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a881317022d73c93d7daa9b79211e5cb18643ee16001632d8f08b879ab5523c' 
  AND token = '/Fjv3vDlTzuwlAHcGCEecSDNNCJ6jgEOogwfH0NxO5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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