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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2f2ca5faa55f264958bfcabe018f7dbf3f04d2298a80c9813547e80b13ced7' 
  AND token = 'gTbvHo+ybUK56vkbKiss4wVyNujRPE/iP8D1RX28l30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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