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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1d705109c5d62d1a5160bbc6cde6218f129ba438c303658821a5de99e411f7' 
  AND token = '5eL1ga0MDMcStjT5ZuXJOFu8lkNe5mneeUt+65r/Otc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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