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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8c28d19c982980dacf8589d36805171a35d4235738ae37abdbc66d30f27b2f' 
  AND token = 'le8V8+YSCh8AotR2kQAzLNGN6wAHvXu3GCUTc3z6wlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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