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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb4d7bf11e48b25dccbe6b8c39c9dcdf4e6a2f72613321e2f33d55c6a6a6fde' 
  AND token = '4sndLeZuNoeWrgpBkIoKYldNtW4bTTErmvb282l6X5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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