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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c80cd9d6335fa79f9650205005a10a0c35d35e577a00bce0800cdba5c7e87f4' 
  AND token = 'hXk4U2zejJ0mg1102i0R5m4ucIxRjr+JiXqLu0C8XJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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