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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa8d35996de261e621d50c5387603156b9194e958c42db5265464b5ffea1df3' 
  AND token = '6ePTd/rHW9E18Fhj4pYiHdkDBv5eK60qWvB8NzyziSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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