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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92911b2896ce9f10f3fbdc1fe07d682147a3c1a1b7c7e791b9d2537c00ba4112' 
  AND token = 'OCK4nxyKmBMZmLxyNHZ55g104QWf6oy7tJMgSXtDhAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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