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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262d4544e6d29378832f490a8f487b8b638ade83c8a46309904b5587a5f32aeb' 
  AND token = '0yS16YRL8CbKewV9zte+yNgHNIE/MxiYMw0a9ZYz5pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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