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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0aa67211b7588555790d49d4ee2e10b7bdac9b58f79741adb5798db9fb920d' 
  AND token = 'HG5dGyHGrlqLQAS91F1+hvelIdmb5ta3GWN4TSDX05k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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