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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a05561447c9b2aeac821965c19aff32ac75a48488e7833c066f8e77692a2f60' 
  AND token = '59R8qgoPK7bPbOGj16V7z7J7B6BU6vyVY6GjEk47spM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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