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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0698c37085d1fb73d9b43107aff039740a4d0046765d73eb1e97258974123cbe' 
  AND token = 'xD1GWD9BsPbedi1MMAaIUoKlarFGhHxw6SOQiizM4q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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