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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff59ef86a882ce41e95ead6a4d2e2a476189c34a9998a7339ff414a8d6b5f6fa' 
  AND token = 'vEGXmL8wvSEvEFek04Ptga5D5X+jmVXq4yRGwy+57l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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