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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34835c850035f58c99eeb2d4cfb9a95909279940d62aab24631e0f0edda41f1d' 
  AND token = 'hqc4p6cGuh80MgIw9EnHGgqSii9LQAEWEIJviF48XhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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