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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c278c79d4ad11b733315e0c0d8c30250119d6a9e0f745dbbe9a3c3b7daf2564' 
  AND token = '/ak7SdNSuavLEpUGUkJ5F1PiImKq8mKLvdjzEeQ19Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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