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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99cdd21c15f9c6ca0457a4a3f92adf1c923eaccfc16e7f5dcd33b95a246f6bb' 
  AND token = 'VmuBnOm6mI1Ab60T0twk2fhjIMKVmx/utTSb4Vpjy5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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