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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6d70145b03e941461c8202157175f075f71ab1e5649f2f695ad9160dbf255e' 
  AND token = 'QsPQyATMRSz+XfQ6nSpSZAFZIBEZucIJbI/h9MY5M3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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