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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f037500fe41e4686647a9c302ad8103b672fa1c6d5eea7d974f30e5e6696f05' 
  AND token = 'w5E7xJ1iOK+OEgOkttxrZWShbZ1H/I+7iP18nPgwMJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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