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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9230aa48048a858e711ba4d57d16bc90cc4b50f461ee96e0402636de00aa8613' 
  AND token = '86GeNlcn7i6dTVVcIdendET1BTTNsss+PCkyxMknZ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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