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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c50a38f44ee57dd34f6764fa738a2878c00541dcb29cb6562c018407f38e33f' 
  AND token = 'wVlY0MYNgHmu8wuoI1kjfR4DQ9O83q3MyeUv1v+Y2DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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