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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa87bbc441d52be667075ca5ddf3e81ae4e4af8f9c8d92c38953e29110ae1f5' 
  AND token = '3kbeIy4eU3VH1g1Y4B2pzFscv8N6OTlMMtKJrrwAjd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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