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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0bf8b367d8abc49199cca04e9e1f890869632270365c29163c26fcfafd6686' 
  AND token = 'A/Q51rVGYGzcWBHi2SI9W+5HGSuP6V8F3QSilifioWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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