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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b52185c2fcb606f540fc51a1ca0271c5261ac43cdeb596d28b7470211bbebc6' 
  AND token = 'PQf7Ntapzpw7TBYzTw1iHz63l39hDvLTlw7fVpz3DRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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