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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595d44e5a0e11d05f54957db2f0b54d0c8afc84b1c5b8955cea845e10d77e09b' 
  AND token = 'MYsvWMTUGaxYXVLzfZ2G7su5lwVFXyh2JktTQH36Sz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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