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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcab806fecf9fc884bfaaf6a312b4a30d4dbfefc84ff9758ec50c5f6b33c697' 
  AND token = 'Zf0hQFAKV1/n71LfRKIoLbDjfx5WhNnRmLrf12awW2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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