SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1dff6680d8d0bf08b3b18645213ca4c1df2407979b99e48b53573306d48046' 
  AND token = '0BF5JyDHCVzJgKsvKFIGvvDv9YYutrxG+q7Dzbe55dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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