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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08770c2cb30a373418349b815a006b857c1dee8a3e639a4ca14901661a24c69' 
  AND token = 'sbkQfDUc0tgQxwtZ54L75m67kk5LauQemuWOVG6sigQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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