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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3982aa1e90fd5431c5fc3d681e7789b03748083fce239118bdfd540190c9b626' 
  AND token = 'spFld+FobapmHr2//1Iz6wPr0+rkfq2SQyTRYoa8oS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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