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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56480b8f51ab41a0cab52e1001162c35c5f0ebcf6006150ca7151b797db11e77' 
  AND token = '/k2pu7gUwP70SWvqPO8F3KTr7dIgaLPUCp3CWywFxQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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