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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2e7ab98aae550d15c9d9900696111c590f604b9d4a566a94aa262226f55d3a' 
  AND token = 'yHWlu+aqRfnHmvuR8fYiFkYyWe43BvOtsPw7VWj41Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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