SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcdabbbfdb45890183c664b1db3d72a90f00d05aa047e7e44df095a0bf32735' 
  AND token = 'wDU/6FGnyQ7JUHJnuk5XlEBcgDQXAH+o4JpR1vWPGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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