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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a23e3465485dfed9cca005e736e2213c5e530cfad060bd57e73bc328e21178' 
  AND token = 'xqOwDcLu3gSIA6kO89ROp62bi+r3TZFxTV63nSZpU3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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