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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8771143de94509b528d44f9617956fb7144ebd436ce3eb59e3d92739a9ff4151' 
  AND token = 'Zykvy9/YW6fb9Bsi+ltS6rtLEPouS/0KoYTdco5kXzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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