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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0808cf30420779b2f29ee53c49a845710e1ff0a09ce3e7d382c0917c4b1b1c6f' 
  AND token = 'bfmQpyUgSD3LYHWsMFhGuIMVr533nXFrhCRW8nsBOpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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