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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301ac84ad6cd88f53e5db4d1d558f26112cee6d6e90af480af2db75730d6b357' 
  AND token = '0Bkb00Qd9mye347pmyvef09E3hY8KluaPqCivWhgBwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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