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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e5bd2d9736621979185762085ab70af4d976ec7a3695483084d4276a37d254' 
  AND token = 'aZ4mBAsrpwB71ce3itFBFIcWkm4Uu7P7AYO4uYl7EGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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