SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74b344d98e82ad25c6ee078e8aa90a6792409fc0a2186c21f21ab26223be90f' 
  AND token = 'eYeoYwuXpzque/VHWjTlO5jQnvv/GKdUGfJVJ9H2/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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