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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68350c22c0f9797ab571d635c4874ce3d25631beccb02f3091740b461a248bfe' 
  AND token = 'IBd7NGPl1CLhedvCs89mm/eBstNyH3+pBldc+ZPIYl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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