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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76366c9ced8670baae51dbcc587e45db84254e557217fd25849e10caef8c12e6' 
  AND token = 'YHo5xv8K4JmMmsXdTxuT3Z0SdC4TAe83vb2H1af+GUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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