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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0094c8922fcfcabf5b501bbca5e4a9929e677cb535398723d192820477e9a0b5' 
  AND token = 'va5GHdKRDQ/gOBVuNg/XstJiaos61cOCWtXxfv2lsGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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