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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3479cd94460047d7567599e2bc0c251a02dab7cfe5fa403b6b199b6075fe48bc' 
  AND token = '8DwM5dxYqegFxRA2dEKfqZARLB7aGCwqd+6Ncail6o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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