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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bcaf63e828540a6df1266cd532bc47ce4ed70d240ab9b731c36c803b58be68' 
  AND token = '0vJWsDFO0Pl9qfg3XOnMjpsnplqSsrJN0MHJKBIq+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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