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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7478aef24c833eadea49be1fc4f57180334519350dd82ddce24cf159b7594693' 
  AND token = 'PhAP7D7wczvV1LFQ1uHywBMbEWtkPjn0VaD/GbGjCt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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