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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27b6aea055100900b3d13c1c3d655ec7e5cf5a37dffd539a6f2528ef153de9b' 
  AND token = '3sLCVMmnAMegjg71lJGVUXOwAS27zfq25bsfz5zavKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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