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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ed1cb8e620051350fac8d2aa07556043d361f77a720656bcd4f7f8fb4b58c3' 
  AND token = 'F7xfrnJwBrxCAb5otPaLZ50DT+uCzJAdvGf2tEXEGmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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