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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e75e2a2326320388cb38e9e1a589f7d578d108d587d4fc9173122eff34f306c' 
  AND token = 'Mw+ljTuUGtgteQ+eG0iUF8NIdvlOAyj81BWOr+iNz1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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