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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816224591fb097b71a46534f12905babc3baf9df4e92aeb7e7e50bf56aa98f97' 
  AND token = 'obdJBzieW/LFA1sdzEz0AXNK82I2sCV6GbiALE193OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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