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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873307410b3a8e674e2b5e3372cc3f362af5f4fbe2df5957ce990958a5bab7fd' 
  AND token = 'g0zgJ/qa4iuIaOb/FN+tk19SNp1iQiPvlaaeq1Sn1nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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