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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff2816874e88c21faff051e9740038fd3800568c9a6e85691e4a37fc0cd06b2' 
  AND token = 'WRlXLQic4aq+gDd5obPuHjMoAmdE2Ogd+J5LddBhbGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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