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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a941c7f7b9f0336bbf83e5ee7674f8c3fda8e2c10b92b648c4cd42f5973bcf7c' 
  AND token = 'DmZ7vrhX/Itv5+9B6a8AuO4Ds+idcFSTCGBrn9qumdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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