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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c77bf957fd207a02a2e5ae339e80e516c39184797235417abc70718a97d1798' 
  AND token = 'zobf9eZUcA018rzqqr1w047y8+InwyPcXWtleyxpDAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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