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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774cb2a702cea2a6deee18d150fa6a66ad5d8ba86b39636d607b24fab84b77b3' 
  AND token = 'avUVMVC0laoWtQhsNH5mP3hHo/zxGoEIKv/ac141ttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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