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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38382c0c547360ca2ef77976d97b1eff9a6cf07ca652017b60e82be25e7ff2be' 
  AND token = 'iOCkr8zbbv+UnxRla4NWhXNyi9N2E8zj/fU085+eEGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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