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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba948d388be8a5808d9dcd33b55158844f6bc6c163a88d8b7f781eb13788e35' 
  AND token = '9JnO8pX2GGpZnXmhbYNpRXEGBPdU1y/i8reOd/NRq2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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