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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b88b2fbe65dd9dd6087928909ebdc2bfb0e8cf95ae0dde5f837611eaae65e4' 
  AND token = 'FHJ8U3iH2CP9nOUT8zan35Uz2NjVgz1mPGx2Mv/51EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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