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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769b7207d69f13a91b87b31a57842111ef39e8f772ca27c8000554067cce6013' 
  AND token = 'rv00zmbmK9+HZH8bA+8FItCcBMRv/kBACQQmuOMRkoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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