SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ff08dfcefc29baab99cad71f558350edd8c137f2cdedd2dd79b164b4669e73' 
  AND token = '+j47gudqRqWbwGvlU6BsNzUfvcumr/UrfEzFj+obKWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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