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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe42c72deb9ed4185d2a3b1f5fae15e67edc72ae17762d70207eb5d43c7eadc' 
  AND token = 'pi6/TPs+CGaWsWAEviAKu5YhMut4d1G1CwjjkYFDvc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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