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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14149d971a7e72a5f21e76ee13967b9813584c26d2af200f899d29378f499139' 
  AND token = 'NxPim2loHoLJkV3+fjZPOj5SFSUWLkJ6tM6qMH4A9iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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