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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf6dc192ba71de760da833aefa7ccb19824a6d9dbf25bd5b5d8fb3d2dda1e30' 
  AND token = 'DJo2fPpVZR8AxACA3RiKU/hd1biR6V+FjUV2QwgkZkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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