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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b8aa93451c43c273b1190b17df65478b43ce9eaf01b1274eb56175ec89b1f6' 
  AND token = 'Qrru7X7SQAP/nCksWT7Fn0lfTs0q4hlq303t11NNbNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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