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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7e0e538669fec334de7f7d2fc403c20c68639676b719b68416e898ede2ef25' 
  AND token = 'VFlWEmQkgBbqWR71QYLiA6RiQuRdNEsDCzl+k+sP1OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00311

JSON explain

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